Postgresql 9.0.4 replication
I did a simple testing on Postgresql 9.0.4 replication configuration.
This is my flow for the setup. I hope these steps can help for your reference.

Environment:
Master = 192.168.0.82
Standby = 192.186.0.83

Install postgresql 9.0.4 on master and standby server

Edit postgresql.conf on master server

listen_addresses = '192.168.0.82'

Edit pg_hba.conf on master server

# The standby server must have superuser access privileges.
host  replication  postgres  192.168.0.83/32  trust

Edit postgresql.conf on master server

wal_level = hot_standby
max_wal_senders = 5
wal_keep_segments = 32

Stop postgresql on master server

tar data folder to a tar file (e.g. data.tgz)

on standby server
Stop postgresql

rename data folder
mv data data_org
untar data.tgz

Edit postgresql.conf on standby server

wal_level = minimal
max_wal_senders = 0
wal_keep_segments = 0
hot_standby = on

create and edit recovery.conf on standby server.

standby_mode          = 'on'
primary_conninfo      = 'host=192.168.0.10 port=5432 user=postgres'

Start postgresql on Master Server
Start postgresql on Standby Server

Grep the following information to verify that replication is running.
On Master:
ps -ef | grep sender

On Standby
ps -ef | grep receiver

You can use createdb to create database on master server. Then, this DB will be replicated to standby server.
You can use “psql -l” to list database on server.